String trimmer knife



FIG. 1 is a perspective view of the string trimmer knife of our design;

FIG. 2 is top plan view thereof;

FIG. 3 is a front elevational view thereof;

FIG. 4 is a rear elevational view thereof;

FIG. 5 is an end elevational view of the right end thereof;

FIG. 6 is an end elevational view of the left end thereof; and,

FIG. 7 is a bottom plan view thereof. 

The ornamental design for the string trimmer knife, as shown and described. 